VMware is a virtualisation technology allowing server or desktop consolidation on modern hardware. Unfortunately, some software engines written before VMware was popular still wish to use antiquated network calls in order to complete their tasks.
One of these programs is Brightstor, which – if you experience network slowness or job failures – needs some registry love in order to work correctly. Frequent users of Brightstor will know the pain, and the problem is made worse using network switches that seem to make the issue worse (i.e. Linksys or Dlink).
To correct the problem, you need to go to the registry at:
HKEY_LOCAL_MACHINE\SOFTWARE\ComputerAssociates\BrightStor ARCserve Backup\ClientAgent\Parameters
and adjust the following registry keys:
UseAsyncIO change from 1 to 0
SetWSSendBuffSize from X to 1
SetWSTCPnoDelay from 1 to 0
MaxSendPacketSize from X to 48
Re-run your backup as required, and typically all of your problems will go away.